and, mr. mudd, welcome. now that we know that this elder slain brother and his mother were both on this tide list, let me back up and ask you, how should lists like this work in the first place? >> you're talking about two different things here. one is an identity list that is if you're an analyst and want to understand everything that the u.s. government might know about someone that is vaguely suspected of being involved in terrorist activity, that's tide. a big list of people, not necessarily a watch list, it is hundreds of thousands of people, about whom you might have some suspicion. separate from that is something like a watch list for aircraft, that is someone you might say is no fly, that person cannot get on an aircraft, because they have been identified as a known terrorist. there are fairly few numbers of people on that second list. >> i'm looking down at my notes on this list. approximately 700,000 people, though some could be, you know, duplicates, variations of spelli spellings, et cetera, some